Example image of eyePlorer eyePlorer map for 'Alternative periodic tables': Chemical element Periodic table Didacticism Periodic table (standard) Actinoid Lanthanoid Transition metal Superactinide Chemical Galaxy Atomic number Extension of the periodic table beyond the seventh period Glenn T. Seaborg Alkaline earth metal Helium Azimuthal quantum number Magnetic quantum number Principal quantum number Paul-Antoine Giguère Alkali metal Superatom Cluster chemistry Aluminium Germanium Carbon Electronegativity Halogen Valence (chemistry) Silicon Titanium Zirconium Hassium Meitnerium Theodor Benfey